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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dbacd5885ce6b13cba392ed35e3d4dbedc9cfe711d7691d4963f6074400e563' 
  AND token = 'YnzIJhihRCSEKZaKE++0Tc/uZCxQX8YnAbDkLPtC40U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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