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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b71654e36c0c087ea3844d86b1165ffd6800b238cab5f83d146dce013969d6' 
  AND token = 'Im4fU4OlsTg+v9SpC2vtWXifHqjD1NqElCkhm8ST5N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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