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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bcdc94962bd5a402cb01cd78c097dac9d3d03417806de7f903ab1c3332299d' 
  AND token = 'S7X/XdIH48+8gbcqCKz3RRJfDM/NXh+dx1yVzMDLplI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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