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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac82f893045a011eb3fc8247808fc59c1a012ab53a79c4a544d87be36c06c402' 
  AND token = 'RNqxeDhJMzCDXk8xjwi3mjdsE3fgTewFynsHChzCKN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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