SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ebe622994c4f5bc4f4e6117c1055baec3908589fd88ceafe7d533537f7dc15' 
  AND token = 'Or38wUml1KDJ/JlsigbPqpEvBqvADmwbXV36fzL7Q30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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