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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd8d0302140200b0d3d70ee3075751c56a6ecbc8abe59f6cbb27a5c85462f73' 
  AND token = '7iljAEq05dww/1fddWJOAmLzEgVcbhY+H40l8ddRqYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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