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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac17ab7d664a1f8ec462eeaa124ee53d5ecbcf6c91a2a187c0e34ba159b4fce7' 
  AND token = 'nZ6tfzVsCG4IMIcxXV9/0MuazhYzAKYR2OyK3P1zt9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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