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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a3889e252c5036053449f27bd57cbb304d4d6afb452e1e37388946aea788306' 
  AND token = 'PNR9FhJfaopWVsrJJX2JbkkC7al1uJXmGhI52y6PBW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00124

JSON explain

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