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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1514c4cd6b977f28bcf3853ff96137201faf8049a4decb68a23ee798b87c55b' 
  AND token = '9cpi0h8wZ6Tbdh0EOlHuioEwG53Ps0Yt9PQV1lLs66U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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