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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b615807fcc36802296aa6b3f54508cd29a3a616e01a5f1855ff2a8b2f4777042' 
  AND token = 'mLBG89tByOX1JDXQEu5B/J0V35XV61LiUJAv+GdP5cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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