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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ccc0d85f29cb50a56f028ac74e25f4d61c173267f844625bda913ade5d3337' 
  AND token = 'jFaQURqei2MdWpXJcP7jSXe5L5Pwm6r3RpYgreTwN9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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