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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd762adbb2ecb02c8eef3f38acbdc775426141ffcae0385524140cb850985ef5b' 
  AND token = 'BFF9tJKzP3wO6C7/uU3Btxrck4AGpn+NTbURGooBqI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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