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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c8c49132cc227284a30fa37f87e09cca8c9095e233a9d2bfbacea71782d3a2' 
  AND token = '9I8WWl93sgAGZt9aCvbfwtsfZQG0RHcJTOY71ywTs4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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