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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48b0c8f85e1fa0ea248f89a14c17f705811e8d90cd6f9763bf3f2163dc1e931' 
  AND token = 'a2kXcsMwcrMJSZMMhLlqljS5BdPi7PZdPwCe1gaS8+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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