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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04d9b789d4440df69333ad9c3d8459fb30637a0493c56598b40d0f7312f68b7' 
  AND token = '9Ct7xnQxTCTBhaIZXnuqjjeIFGpe5sVAI2cXNLIPBHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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