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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e4ca71d9e86bf1c7abb1035cb5498a8cdd0c0bdbff0bbee534363a796c82710' 
  AND token = '0lLxXjEOjJEDktr7+KsX75B9TTv2nVpNpeqYoedAQ90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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