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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f35f5f8de7189a3b7ec8fdd0f405aa75012b80a2ea957117124dab598c5735b2' 
  AND token = '3y0rjw4JIN2OT7oE70xtzx9QSd9d6rc21TrzV978owc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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