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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68363fbd37d6cfd782a68a10321e0c0ed9dede1dbc687ad867d63d5f8206c26c' 
  AND token = 'hwlQxhVdZspaoZxV9l7gl6KgKPLx8iqTaCpLZCge7dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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