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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf7f4b82726562351cd3f549687978c05b013cc821c91e169658a69dda85f66' 
  AND token = 'Zg5Q1pkQ5apEqJX9VQaU6plDsuL9h87/t1kA1hfMzco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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