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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0969f419248dd2968a47eefba337592610132d38e9d54cde58e6c0b684987d6b' 
  AND token = 'rUMDktqhqF7H76cNQJms3JTwlVydqTkJuftCJt9OCgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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