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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '800cd0bdd615a95f9182ea6e4999945ec90478a848db42d7f777c44a9746d571' 
  AND token = 'Ck0YjgzJ8b5IqTrlZdvr15dTcwDpghws+qPdCJCgXOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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