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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093f14ab8be5d20fe25332282d106ef073e44d799aa586f62f34413ba03911ac' 
  AND token = 'RKn2TLaDma10P1X4/ZNR/trq+BrxOUGrXnX69ueZCBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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