SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2adcf05002da5449338d2e407133955224ad4befa498ced0830c849782106551' 
  AND token = 'wFV143jscG80/OEYIggLqvNE1vMUyB5pblOH/sgSC+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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