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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1815994594b37f5dca16c0293c2a142fd654e342efbfdda814ae3969ff3112e' 
  AND token = 'fD4IVnrVyT1D0KYx3FUmvYy+Olm/2MHVXGsIMgFzFIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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