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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d4cd8b0a524d4c24774b4ef0a3bc56d5a3650c177b9828512261dd39e8a6c3' 
  AND token = 'oQfTdVqI8GDYq45lWi5iH2p2j0AmQmxzX+WQfI0LjKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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