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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '042325f4804914dc18c8b320c87355dfecf50dc4904e286d876002a9c022fc5a' 
  AND token = 'J58+eT5qJMCdxRQNUYlGZt0kE9Tt+hRlJzKqyt8tTtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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