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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58df4ea099ceed94da96805aade09f6c68f0397acbf004c581a7cfa6f1e328d7' 
  AND token = 'TcDtOwH9Us7JbwOQRL4Nwn625xbWZgX7n8hOr6RV23E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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