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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf948f8dcec39f0ed5f247f299ecc961acc9d1301d2a0cd9468490c99c10018' 
  AND token = 'xl2Svk8Oxmsh+2/P1QxI+aoNsoSTMKpwi8oWfwPsGUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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