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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e715d067bd40220d5f18c2dca007f39203e4b9f2e4f7d19bf7451d31b1d659' 
  AND token = '0ia3JpY2ktvyh8hz7z2AYPByCcKwjFcd4uNKejGTE7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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