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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4256b2dbfa919e694b7e567f19a916ca86e88671373ee548e7730fda795ef3ad' 
  AND token = 'kEHu4+vN3MvlFdHHsxt5R630rGVC5f3tdvFvq4+cWg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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