SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd589ea49b5a6087264ecb334c272e5ddcd662bd217e6237431f030d24240a01' 
  AND token = 'TrnG4w9Cm1rvIxKgx4J+nGLHztOoVhqw0sPQBB4JZeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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