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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78ebc5ae1fafd16cd9cd62d454532ac50af8a0caa0e23f306f22a977eb3e293b' 
  AND token = 'ULa2NbZUf0oISi0FRI4v9x/Twba75AP8vznYc6gBUsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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