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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8599513bce6a6a6af6dbe8162f2409197a325f00a0505900565037d7f0706c7' 
  AND token = '9qz94DD+oiofa4ToBBfaW+gh6/aMpreqQ4ydU/BJprM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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