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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bf658ece3520c6530468662cc5e4de6f914ec2917681cf6f480678f824e51b' 
  AND token = 'gry+/Hr4N3HsVrLlaUxiC0WNEh7tbfasYg2IjGwGIPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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