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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7509b304e6765181e24c58e90814b05905e06687fcc36c66ce64e634e9513a23' 
  AND token = 'mpbYLwF5SGV2yHUCCw/QGKPw32lF4U6yBem21UQtjGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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