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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ef88df25338e7a866b63ece10e6e1387ff11c0c40953cf75c383f2d702e536' 
  AND token = 'KjtKVaFUuGzRvTVYnsMSeIOyGf/h3SQQMIVI7Uh7ieI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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