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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f24095440932191dcdda127855c1b2f4265801e8fa7e1e12bcc567faf8e47c' 
  AND token = 'QX8vp5B0FP7FQF0HVQnSeN7M7DK8hlL6hFkrG7nxaw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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