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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f35d317842312e62220005179d503460db60e6674ae8a9075fb174ac0e584bc' 
  AND token = 'fLOc4ZdN760qGj+hWPFsJdR/opI7vLEApMZ6n0IMnio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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