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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc11427b057dd156a80102ac0095720d24042fe15171068e1048cfae408f104' 
  AND token = 'wo8Ey8raiEDmu3SoDipNQoYyWQQ+Xc6YLOAmdJlsvPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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