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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60fe041258b2c0fa49ea28dad8dcbe654b031740c7379269397a73f3b83a5849' 
  AND token = 'eUYoiMfoqkM2McXnm8sgBNKQX9j4cU3jmIWNlJt0LM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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