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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af85daf2f97743edf2961086daeee0f6a4e4c902ede2a23e7bcd8e11ead899d5' 
  AND token = 'nlHfo9kmnez4QeY6uQFxpMS7/pkZMKQ9bnJbGuI6dyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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