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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d5577fa423b36c90d638b12a541f6361aedabecce53a1ad88519aef92ed794' 
  AND token = '1FM02XAJOlyYhvHDaGH5IsOfJPo2c1Ko18F7mHy+hXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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