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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b059c27389363f0c665c722faa9a978693b1dca9579c15c220863d977e78681' 
  AND token = '/TA7Bufs+dlUDMpcqfGrtr5UB/Lz/1FB2l9ypXkaSh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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