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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c0a1b4acb8913caacaf605bb11df2e802750610a79bb6faaaf8b539dc45690' 
  AND token = 'Tq64KjMjcmUJSqlufwASH7pKzQsHapeT+xcGeSx+AhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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