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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '826bf27078d9328b7e800c79446bbca8f3b9288b63e7ee3d84dc426720d8eaa1' 
  AND token = 'SznvI6olPi1sz5p73KrSDDxovj884wxPIZ6sLQOjOH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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