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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed66a8d9538fa2abe794552eb017f740e176afaad1bbb83d0c3405962a5092a9' 
  AND token = 'SWs1iXkHqgvF6vMmgaqmfT3SD88crg3E0UD8q3cf92w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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