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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b603b6b7fbf3cb5749cb6104c028379e7c5e1e224f99fafe9a279fadd9760488' 
  AND token = 'oujkEwPPf/amIzElzXHIhsfljtUjZso0r0iCpnAGg4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00238

JSON explain

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