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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e623d83c5e10374b3b3e32990a68cefc8f5ca7babce85fb8bdf064c4fe6f16' 
  AND token = '5e0ubUebhZzKj4GjV2N6PNqUW0sYjoJMBQ6CCislYCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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