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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffcd2419525ec3c0d709b878844e1f7064ce85fd207a7fc38d36daf038346c1a' 
  AND token = '0mInFVISthtp3sf4fuizB9i0TBJ4EdTae1AsLhH3qhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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