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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59685a97c2fe262657b3490c1c17d47d3cc81f25d8c4da929418d2d17fd5bd4d' 
  AND token = 'Rd1bkjUznI+VptsixUDTb5fbZ+iCb0zwlFmAG0EQD+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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