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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd950c3682afff42f5e049e93b6b6d6e3683686ac8380d57ac340c73b993fde' 
  AND token = 'rrsG5TRmcJzJRMauly18ckpj7pxa285bHM8XyxsscjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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