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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40de3b24ae471cf1a0cf4d2853297a2bf7dd78899361b75c5cc51895b25a9bad' 
  AND token = 'ruy49zUdCKOWKi+He9pGpLQrAe3vW75znz9XoH2Al+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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