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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86be72c06ef1d8a0c5aafd824cd013c06ace4274dd2ca9aaff64f970bc6a548' 
  AND token = 'XcrL2DDPn6EgR0E3mnHppzpV3VccmA+5oNLH/pgT7bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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