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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e11a0d4ba3207505477cbe684188e38db34e98b5c61c0475609b66943a21384' 
  AND token = 'zxQXLfw/9XbOboiQYQtXbOfw/O/h2i0bZGwMlX34TQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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