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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdec29d276da2823275ae9dd84547762de66167f59af19103d8530b4b1f7420b' 
  AND token = '1Azl3CS0/ngbKv01OLToj17QcqugDYdLge965ya9XXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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