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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a60f656ef1dc65c832983d1f2d671bbf19e4c7b5f53cd528acd0e40e443204e' 
  AND token = 'puE1dWx/xDe5w8q00AanDkUjNqJOfvdua8YXbu0Rv8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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