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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ace3f89bf28ed2a136eee3eda87f0ae63912e37f49928ede8041b94f3ce8eaf' 
  AND token = '4mi8npM2202S2ojnNTMuIiiiteHiFozBZUajfbt1XgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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