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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f8bb46741babec1a01c3353043fb3a77ee295b9c90b289d0e56b0ac45202d0' 
  AND token = 'MIKQ4uQphFgsn3o0JSCSLQ+raEI63G9h5r6jUBDjOcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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