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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a031094b85715c5c295d974053141bf79e92b749ff2ddafaee1ca11b60eee8f0' 
  AND token = 'brP7mlk5lySMv+4+/zz8o9BGdcSz0giXZp9ZhQH2AaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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