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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cee807501c5b74349f7684764a55813dbd98f6a075852b77f44e81dce0121a0' 
  AND token = 'E5iHJk0gK4vKLqsbbR3y9p4VsmPr6qDX6sUqAQ/25EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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