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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65bc712ca31a4e3328dfbd3c6e0c97cf0563563b2682a2af3a7705cac2be53e3' 
  AND token = '51ui8oL2/O+a1AKaCFkXpbv/QP2wuTDQx5CEsbrrai4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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