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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f3f24ca7777195a9fa662a0e177734cecac22bd4db34cb32ee33d7ba195a0ea' 
  AND token = 'D2SJxznTEETdYxl+F41I5bHeA2h7KbbM/pOAXBDDO9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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