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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '286672ee12d0b439a0c084f8003a879a833b0ce04a6b3cbdd538ecf37c6980a4' 
  AND token = '8mkIadOeVtvu/eZBWwu8spHAS66/UgTL1ll3PUZiUD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}