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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca209626f4c14b4e574a5adb7f795e6044555307cc2c0187866d21d1ca612e9e' 
  AND token = 'eJeaza6CSBtu3qcP5jioigmgwqoNzcnZTr04UX5ghNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00142

JSON explain

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