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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c35627e137a51d1c2876484ed88d149bf867622fd2c0b30e2478bb51f647779' 
  AND token = 'aL6woLOM6yAeewEg0RfBqkpXn/rC0diQSOq0yNChbk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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