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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb44e83cc36adc3acd9a4fc1af4dad363b59af9d9f961542587f0a074f1bc76' 
  AND token = 'JEn56PDapGiO1l8A1x3XAhI9PTYZ4ITnCGMdSOYHgyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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